JasDB vs JayDB

JasDB is a document-based NoSQL database for rapid application prototyping and embedded use, including on Android phones and tablets. It stores JSON documents and can be embedded in software or scaled out. JasDB provides Java and REST APIs, with an entity-mapping solution for Java and JVM languages. Its REST interface can query and manipulate data, and Oberasoftware describes the query engine as having full query capabilities. Security options include users and groups, with OAuth available through the REST interface. JasDB is self-hosted and available for Android, Linux, macOS, and Windows. To start it, the quick-start instructions say to unzip the download, run start.bat or start.sh, and open http://localhost:7050. Oberasoftware has also announced a Docker container. The software is free and released under the MIT X11 License, with a restriction that redistribution to recipients be free of charges or fees. The license provides the software as-is without warranty. Oberasoftware describes the database as useful for quickly prototyping applications and accepts questions or assistance requests through its website.

JayDB is a JSON document database with per-user sign-in, aimed at static apps that need user, session, or tenant data without an app-owned backend. Documents are JSON at slash-separated paths, and the first write creates the namespace. Its REST data plane supports GET, PUT, DELETE, and prefix listing. Browser apps can authenticate through OIDC with Authorization Code and PKCE without embedding a client secret. Listed identity providers include Google, GitHub, Microsoft, generic OIDC, and custom OAuth2. The official SDK supports authentication, token refresh, typed document access, and compare-and-swap operations. ETag-based compare-and-swap may reject a write with HTTP 412 if the document changed since it was read. JayDB is available as managed cloud software or as a self-hosted Go engine under the MIT license, using S3-compatible storage or local disk. The free plan is free and includes 1 GB stored, 100,000 reads per month, and 10,000 writes per month; usage hard-stops at those allowances. Metered rates are $0.05 per GB-month of storage, $0.20 per million reads, and $0.50 per million writes.